Fi Audio Alpha v2.1 10 S4

10″ subwoofer · 4 Ω · 750 W RMS

Fs 40.2 HzQts 0.48Vas 0.44 ft³Xmax 0.67″

Recommended box

For a sedan, one sub, 750 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume0.49 ft³ (14 L)
Qtc0.65
Fc55 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)12 5/8″ × 12 5/8″ × 9 1/8″
Open sealed box in designer

Ported

Net volume0.92 ft³ (26 L)
Tuning (Fb)34 Hz
Portround port Ø3″, 15 1/2″ long
Port velocity at 750 W214 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)18″ × 15 3/4″ × 9 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40.2 Hz
Qts0.48
Qes0.51
Qms7.06
Vas0.44 ft³
Re3.2 Ω
Sd48.1 in²
Xmax0.67″
Vd32.2 in³ calc.
Mms172 g calc.
BL16.5 T·m calc.
EBP79 — sealed or ported calc.
Sensitivity, 1 W / 1 m84 dB calc.

General

Size10″
Voice coils4 Ω
RMS power750 W

Mounting dimensions

Ø11″cutout Ø9 1/4″mounting depth 6 1/2″magnet Ø≈ 6″
Cutout diameter9 1/4″
Mounting depth6 1/2″
Overall diameter11″

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Fi Audio 10″ models